patch-1.3.94 linux/arch/m68k/kernel/process.c
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- Lines: 201
- Date:
Mon Apr 1 21:40:27 1996
- Orig file:
v1.3.93/linux/arch/m68k/kernel/process.c
- Orig date:
Thu Jan 1 02:00:00 1970
diff -u --recursive --new-file v1.3.93/linux/arch/m68k/kernel/process.c linux/arch/m68k/kernel/process.c
@@ -0,0 +1,200 @@
+/*
+ * linux/arch/m68k/kernel/process.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/malloc.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+
+asmlinkage void ret_from_exception(void);
+
+/*
+ * The idle loop on an m68k..
+ */
+asmlinkage int sys_idle(void)
+{
+ if (current->pid != 0)
+ return -EPERM;
+
+ /* endless idle loop with no priority at all */
+ current->counter = -100;
+ for (;;)
+ schedule();
+}
+
+void hard_reset_now(void)
+{
+ if (mach_reset)
+ mach_reset();
+}
+
+void show_regs(struct pt_regs * regs)
+{
+ printk("\n");
+ printk("Format %02x Vector: %04x PC: %08lx Status: %04x\n",
+ regs->format, regs->vector, regs->pc, regs->sr);
+ printk("ORIG_D0: %08lx D0: %08lx A1: %08lx\n",
+ regs->orig_d0, regs->d0, regs->a1);
+ printk("A0: %08lx D5: %08lx D4: %08lx\n",
+ regs->a0, regs->d5, regs->d4);
+ printk("D3: %08lx D2: %08lx D1: %08lx\n",
+ regs->d3, regs->d2, regs->d1);
+ if (!(regs->sr & PS_S))
+ printk("USP: %08lx\n", rdusp());
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+void flush_thread(void)
+{
+ set_fs(USER_DS);
+ current->tss.fs = USER_DS;
+}
+
+/*
+ * "m68k_fork()".. By the time we get here, the
+ * non-volatile registers have also been saved on the
+ * stack. We do some ugly pointer stuff here.. (see
+ * also copy_thread)
+ */
+
+asmlinkage int m68k_fork(struct pt_regs *regs)
+{
+ return do_fork(SIGCHLD, rdusp(), regs);
+}
+
+asmlinkage int m68k_clone(struct pt_regs *regs)
+{
+ unsigned long clone_flags;
+ unsigned long newsp;
+
+ /* syscall2 puts clone_flags in d1 and usp in d2 */
+ clone_flags = regs->d1;
+ newsp = regs->d2;
+ if (!newsp)
+ newsp = rdusp();
+ return do_fork(clone_flags, newsp, regs);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+void copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+ struct task_struct * p, struct pt_regs * regs)
+{
+ struct pt_regs * childregs;
+ struct switch_stack * childstack, *stack;
+ unsigned long stack_offset, *retp;
+
+ stack_offset = PAGE_SIZE - sizeof(struct pt_regs);
+ childregs = (struct pt_regs *) (p->kernel_stack_page + stack_offset);
+
+ *childregs = *regs;
+ childregs->d0 = 0;
+
+ retp = ((unsigned long *) regs);
+ stack = ((struct switch_stack *) retp) - 1;
+
+ childstack = ((struct switch_stack *) childregs) - 1;
+ *childstack = *stack;
+ childstack->retpc = (unsigned long) ret_from_exception;
+
+ p->tss.usp = usp;
+ p->tss.ksp = (unsigned long)childstack;
+
+ /* Copy the current fpu state */
+ asm volatile ("fsave %0" : : "m" (p->tss.fpstate[0]) : "memory");
+ if (p->tss.fpstate[0])
+ asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
+ "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
+ : : "m" (p->tss.fp[0]), "m" (p->tss.fpcntl[0])
+ : "memory");
+ /* Restore the state in case the fpu was busy */
+ asm volatile ("frestore %0" : : "m" (p->tss.fpstate[0]));
+}
+
+/* Fill in the fpu structure for a core dump. */
+
+int dump_fpu (struct user_m68kfp_struct *fpu)
+{
+ char fpustate[216];
+
+ /* First dump the fpu context to avoid protocol violation. */
+ asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+ if (!fpustate[0])
+ return 0;
+
+ asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+ :: "m" (fpu->fpcntl[0])
+ : "memory");
+ asm volatile ("fmovemx %/fp0-%/fp7,%0"
+ :: "m" (fpu->fpregs[0])
+ : "memory");
+ return 1;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+/* changed the size calculations - should hopefully work better. lbt */
+ dump->magic = CMAGIC;
+ dump->start_code = 0;
+ dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
+ dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+ dump->u_dsize = ((unsigned long) (current->mm->brk +
+ (PAGE_SIZE-1))) >> PAGE_SHIFT;
+ dump->u_dsize -= dump->u_tsize;
+ dump->u_ssize = 0;
+
+ if (dump->start_stack < TASK_SIZE)
+ dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
+
+ dump->u_ar0 = (struct pt_regs *)(((int)(&dump->regs)) -((int)(dump)));
+ dump->regs = *regs;
+ dump->regs2 = ((struct switch_stack *)regs)[-1];
+ /* dump floating point stuff */
+ dump->u_fpvalid = dump_fpu (&dump->m68kfp);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage int sys_execve(char *name, char **argv, char **envp)
+{
+ int error;
+ char * filename;
+ struct pt_regs *regs = (struct pt_regs *) &name;
+
+ error = getname(name, &filename);
+ if (error)
+ return error;
+ error = do_execve(filename, argv, envp, regs);
+ putname(filename);
+ return error;
+}
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